Apparently Styles and Swift are now back on, even though the songstress was left devastated by their previous breakup.

"Taylor and Harry have been quietly seeing each other again," a source told Radar Online.

"Taylor really liked Harry and even though they weren't exclusive, he hinted at making it official with her just before he took off to Australia... [one morning ] Taylor had all these texts from Harry begging for a chance to explain and telling her not to believe everything she reads.

"She immediately googled Harry and found all the stories and pictures of him kissing Emma. She was heartbroken."

Swift has been romantically linked to John Mayer, Joe Jonas, Jake Gyllenhaal and Taylor Lautner in the past.

It's rumoured that she simply comes on too strong.

"When Taylor dates someone she jumps in full force, but Harry is being a little more cautious this time around," the insider said.

"Taylor is a hopeless romantic, so she's really hoping it works out with Harry.

"Harry's being really sweet with her right now and careful not to hurt her. But at the same time, he's a young, popular heartthrob who isn't quite ready to be tied down."